What are the differences between handling single-level and multi-level navigation arrays in PHP?
When handling single-level navigation arrays in PHP, you can simply loop through the array using a foreach loop to display the navigation items. However, when dealing with multi-level navigation arrays, you need to implement a recursive function to iterate through each level of the array and display the nested navigation items.
// Single-level navigation array
$navItems = ['Home', 'About', 'Services', 'Contact'];
// Loop through single-level navigation array
foreach ($navItems as $item) {
echo '<a href="#">' . $item . '</a>';
}
// Multi-level navigation array
$navItems = [
'Home',
'About',
'Services' => [
'Web Design',
'SEO',
'PPC'
],
'Contact'
];
// Recursive function to handle multi-level navigation array
function displayNavigation($navItems) {
echo '<ul>';
foreach ($navItems as $key => $value) {
if (is_array($value)) {
echo '<li>' . $key;
displayNavigation($value);
echo '</li>';
} else {
echo '<li><a href="#">' . $value . '</a></li>';
}
}
echo '</ul>';
}
// Display multi-level navigation
displayNavigation($navItems);
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